Usually a kid's room is very colorful, and the colors are bright and patterns wild and playful. If you have vivid purple walls with polka dots it is very difficult to tone down the atmosphere without re-wallpapering or painting the walls. If you cannot redo the walls: reduce all the other colors in the room.
Try to keep the color palette in variation of three-four colors. The opposite color of purple is yellow. Bringing yellow, beige, brown or green items in the room will only bring out the purple more.
Use white, black, silver, blue, and grey to cool down the colorscheme.To make the sopistication perfect, use mature type items, rough fabric like wool will bring softness. Keep the decoration items to the minimum. Try have everyhting in threes to bring dynamic feeling to the room.
Like three red items, three square items, three plants etc.The crown in this room would bee three color splashes, something small. Perhaps Aqua or Lime. That really depends on the tone of the purple.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.